Crown Ether Complexes of Phosphonium Salts — The X‐Ray Structure Analysis of [(Ph3PMe)2·[18]Crown‐6][PF6]2

A higly symmetric cation consisting of two phosphonium ions and a crown ether molecule is obtained in crystalline 1. In 1 the direction PMe…Me′P′ coincides with the symmetry axis; the 18C6 host is oriented at right angles to this. All methyl H atoms are bound by discrete H bridges at individual O atoms. These H bridges are in each case directed towards the “rear side” of the crown ether ring. equation image